Firestone Double Convoluted Air Spring, 9.00 X 3.60, Truck Part No. W01-358-7555 Firestone W01-358-7555 W01-358-7555, Firestone Double Convoluted Air Spring, Firestone Airide Air Bag 7555 9.00 inches x 3.60 inches 2 Year / 200,000 Mile Warranty Aluminum